Improvement in sewing-machines



f tu),

UNITED STATES- PATENTV OFFICE.

EZEKIEL BOOTH, OF TROY, NETW YORK.

1M PRovEM ENT IN sc-:wl'Ncv- MACH IN es.

Specification forming part of Letters Patent No. 28,959.. dated July 8, i860.V

To all whom it mag/,concern Beit known thatLEznKIEL Boorn, of Troy, in the county of RensselaerV and State of New York, 'have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description of the'construc-l tion and operation of the same, reference being had to the accompanying drawings, in

Figure 1 represents a perspective view of said 'sewing-machine, the platform being represented partially as broken away to show the Figs. 2, 3, and 4 rep ferred to. y

My invention relates to that class of sewingmachines in which two threads are used forforming a loop-stitch by means of a needle and looper; and my invention v.consists in providingsaid looper with a spreader, which, 'although moving with said looper, is operated independently of it for the purpose of spreading the loop, thus causing said needle in' its downward motion to pass through the loop without failure, and consequently preventing itfrommaking drop-stitches. v

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A represents the frame ofthe machine; B, the table; C, the 'needle-bar, which is operated by means. of the lever D turning on the fulcrum a, the lever D beingoperated by the pitman E, which receives its motion from the vcam F, which acts on the pin b.

G represents the looper. It is secured to the arm H, which is secured to therock-shaft 1 the latter receiving its motion from a camgroove on the rear side of the diskK, which operates the arm L, attached to the shaft I, and

which is of such a shape as to impart to the looper a reciprocating motion, which, at certain intervals, is arrested to afford the needle suiiicient time to pass through the loop of the looper-thread.

c represents the spreader. Its elastic, shank d is secured to the side of the looper-shank by means of a set-screw, g, or otherwise, and its projection or tongue f passes'through a mortlse in the looper-shank, and can play therein longitudinally.-

M represents a slidingrod, which can move the tongue j', and the foot mof said rod is in contact with the front side ofthe disk K, and

when operated rby said disk is caused to slide 'v over the inclines fn., by which the -rod M is moved longitudinally at certain intervals, and

when so moved spreads out the loop of thel looper thread. l

The operation of the machine is as follows: When the needle o' commences to rise from its lowest position, the looper G and spreader c are in close contact, as represented iu'Fig. 2, and they thus pass together through the loop' of the needlefthread. Assoon as the looper has taken up said loop its motion is arrested, while the needle continues to rise, and as soon as the needle has entirely cleared the looper the rod M is moved by one of the inclines u of the disk K, and. its. arm h, passing on the tongue g, pushes the spreader'c into the position represented in Fig. 3, in which the loop of the looper-thread (represented in blue) is enlarged to such a degree that the needle on its downward motion cannot fail to ypass through it, and thereby insure aperfect stitch. When the needle has taken up the looper-thread, the looper reoedes and the rod M is pushed back by the recoil of the spring N, which presses it against-the cam` n on the face of the disk K,`

and the spreader c, being thus released, closes by the action of its elasticy shank d, and the looper and spreader may pass again through the loop of the needle-thread for making the next stitch.

It will be observed that the opening of the spreader and the spreadin g ofthe looper-thread. is performed at a time when the looper re mains stationary. The loop itselftherefore, remains stationary, while the needle passes through the same, which renders it impossible for the needle to miss the loop. The further Vadvantage, of this arrangement is that the spreader can be opened at a 'timelwhen the needle, in its upward motion, has cleared the same entirely. This is of great importance, for the looper has to take up the needle-'thread atthe moment the needle commences to rise, and its motion is arrested before the needle has cleared the same. If,v therefore, the n10- tion of thespreader is dependent upon that of the looper, it is a very difficult matter to construct the machine in such a manner as that the needle Will clear the looper before the motion -ofthe looper is;l arrested to operate the spreader, ardiculty which is 'entirely obvi- -ated by givingl the lspreader a motion independent of the moton'of the looper. v

' Having thus fully described the nature of my invention, what I claim las new;T in the 'con-- struction of sewing-machines, and desire to se cure by Letters Patent, is-

Causing the spreader c to spread the loop of the looper-thread vby a mechanism that is in` dependent of the mechanism that operates said looper, and While said looper remains stationary and after the needle has cleared the same, substantially in the manner and for'the pur- A pose herein described.

EZEKIEL BOOTH.

` Witnesses:

J. B. PARMENTER, 'IHEoDoRE MAY. 

